Install fc_local.conf only where used

...and at least issue a SAL_INFO when it's missing (there may theoretically be
multiple directories, and it need not be present in every one, so nothing
stronger than SAL_INFO can be used)

Change-Id: I9b7257a551626e5ad081cfb75422a8bd71b86aa4
Reviewed-on: https://gerrit.libreoffice.org/42714Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>

postprocess/Module_postprocess.mk

@@ -28,11 +28,13 @@ $(eval $(call gb_Module_add_targets,postprocess,\
 ))
 endif
 
-# For non-WNT, add instdir/share/fonts/truetype/fc_local.conf when it shall
+# For configurations that use fontconfig (cf. inclusion of
+# vcl/unx/generic/fontmanager/fontconfig.cxx in Library_vcl), add
+# instdir/share/fonts/truetype/fc_local.conf when it shall
 # contain content from at least one of external/more_fonts/fc_local.snippet
 # (conditional on MORE_FONTS in BUILD_TYPE) and
 # extras/source/truetype/symbol/fc_local.snippet (unconditional):
-ifneq ($(OS),WNT)
+ifneq ($(USING_X11)$(ENABLE_HEADLESS)$(filter ANDROID,$(OS)),)
 $(eval $(call gb_Module_add_targets,postprocess, \
     CustomTarget_fontconfig \
     Package_fontconfig \

vcl/unx/generic/fontmanager/fontconfig.cxx

@@ -681,6 +681,8 @@ void PrintFontManager::addFontconfigDir( const OString& rDirName )
                         reinterpret_cast<FcChar8 const *>(aConfFileName.getStr()), FcTrue);
         if( !bCfgOk )
             fprintf( stderr, "FcConfigParseAndLoad( \"%s\") => %d\n", aConfFileName.getStr(), bCfgOk );
+    } else {
+        SAL_INFO("vcl", "cannot open " << aConfFileName);
     }
 }